Weldrod



Patented May 1, 1934 UNITED STATES PATENT OFFICE Application October 5,

Claims.

This invention relates to improvements in weld rods, and particularly that class of weld rods having a heavy coating or shield thereon.

It is the object of this invention to provide a 5 weld rod composed of some suitable metal, with a shield or covering of fabric applied thereto and adhesively attached.

It is also an object of this invention to provide a weld rod in which there are arranged longi 1o tudinally of the rod fibers or filaments embedded in an adhesive that is a refractory agent.

It is also an object of this invention to provide a weld rod of some suitable metal, having one or more layers of fiber wound thereon and adhesively applied thereto by means of a refractory agent. This agent may be any suitable chemical compound, such as silicate of soda.

The fabric used for wrapping or forming a cover for the rod may be a coarse grade of ducking or muslin. The coarse ducking seems to be better adapted than fine ducking because it retains better the proper proportions of chemicals with which it is soaked. Sodium silicate is the main ingredient used for soaking the wrapping of the rod.

This chemical acts first as a binder for holding the muslin or fabric in place, and second, it acts as a retarding agent, preventing the rapid burning of the muslin or fabric any further back than the electric are produced in the process of welding. In fact, the sodium silicate acts as a refractory agent, forming a crater for the arc and allowing the electrode to melt up in the crater and shoot from the crater with some force. The sodium silicate also leaves a glassy slag over the weld itself after it has been finished. The muslin or ducking, being composed of a hydrocarbon in the form of a cellulose, breaks down into carbon monoxide and carbon dioxide and provides an enveloping gas for inclosing the are.

It is important to get the proper thickness of the wrapping. This may be effected by determining the number of turns of the fabric to be applied to the rod, which may depend upon the size of the rod and the weight or thickness of the fabric. If there are too many turns of the fabric it will not burn away fast enough, with the result that no proper crater is formed and the beneficial effects of the shielded arc are lost. It is also important that the proper amount of sodium silicate be present in the fabric. In the present drawing there is illustrated a rod covered with applicant's fabric.

Referring to the drawing:

Figure 1 showssuch a rod broken away, with applicants fabric wrapping around it.

Figure 2 is a cross section of the covering or wrapping with the rod removed therefrom.

Figure 3 is a cross section showing the rod with the wrapping around it.

1931, Serial No. 566,837

Figures 2 and 3 are enlarged to clearly bring out the nature of the fabric and the strands or threads that compose the fabric. These figures clearly bring out the relation between the rod, the fabric and the filler of adhesive material which causes the fabric to adhere to itself and to the rod.

The rod isindicated by the numeral 1, while the cover as a whole is indicated by the numeral 2. This cover is made by wrapping fabric around the rod. This fabric is composed of threads arranged longitudinally and transversely. The longitudinal threads or filaments are indicated by the numeral 3 and are large and heavy. The transverse filaments or threads are indicated by the numeral 4 and are small and light, being 'sufliciently large and strong to hold the main longitudinal filaments in proper position with relation to each other and to the rod whenthe fabric is wound thereon.

The fabric is embedded in a filler 5, which contains or is formed of sodium silicate. The longitudinal threads are large and burn with practically the same degree of rapidity so that the arc end of the rod is properly exposed by burning away all the filaments. The transverse or circumferential filaments are small and easily burned so that their burning does not materially affect the degree with which the longitudinal threads or filaments burn. The degree with which the filaments burn depends upon the thickness of the cover, and may be regulated to suit the conditions under which the rod is to be used.

Among the advantages of a rod of this kind are the following: The covering does not dry and crack under atmospheric and moisture conditions, and rods thus formed can be handled roughly without marring or' injuring their qualities. With electrodes of the type here described the shielded arc is smooth and moves evenly, and there is little spattering of the metal.

By means of the rod here described welding may be produced more rapidly because a higher degree of voltage can be used than is customarily used in connection with rod welding. Voltage as high as forty volts may be used, and the rapidity with which the welding is effected may be increased two or three times, and at the same time a very ductile weld is provided, and one in which there is great tensile strength and rust-resisting qualities.

It will be understood that I desire to comprehend within my invention such modifications as come within the scope of my claims and my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A metallic-arc weld rod comprising a metallic rod having a fabric cover composed of heavy and light filaments, the heavy filaments being arranged longitudinally of the rod.

2. A metallic-arc weld rod comprising a metallic rod having a fabric cover composed of heavy and light filaments, all the heavy filaments being arranged longitudinally of the rod and the light filaments being arranged around the rod.

3. A welding electrode consisting of a metallic rod and a coveri'ngtherefor, said covering consisting of heavy longitudinal filaments, light trans verse filaments and a refractory agent. 

